We are building an underwater hydrophone array and would like to find a submersible pressure sensor which can be connected at the end of our hydrophone cable to measure the water depth. The power we will use in the cable is 18 volts. We would prefer the output of the transducer to be a 2 wire analog 4-20mA current loop. Also, we would like the transducer to be able to measure water depth from 0 to roughly 200 meters (~305 psi) in an ocean environment.
If you are terminating the sensor inside an enclosure on the end of the hydrophone cable then we would suggest using a non-vented absolute range and subtract the surface barometric pressure from the sensor reading. The LMK458 with a copper nickel alloy housing is suitable for immersing in seawater and is also marine approved for use on ships.
LMK458 Submersible Seawater Depth Pressure Sensor
- Pressure Range: 320
- Units: psi
- Reference Type: Absolute / Non-Vented (0 to +P)
- Output Signal: 4 to 20 mA, 2 wire
- Accuracy: 0.25% FS
- Installation Type: Probe version with nose cone
- Housing Material: Copper Nickel Alloy (seawater compatible)
- Diaphragm Material: Ceramic Al2O3 96%
- Media Exposed Seals: FKM
- Cable Type: TPE-U (125degC max)
- Cable Length: 2
- Cable Length Units: Metres (m)